When you have ordered an new license or a renewed license, at customed, you can download the update from the website.
To find the file, that is needed to upgrade the CodeMeter for the custo screen check, you have to go to your Service provider login
Choose license diag 4.x and enter the license number from your custo screen check software into the field. When the license has been activated a zip file will be shown and can be downloaded .
in the following link you find how to update the CodeMeter with the downloaded file(s)